I like your idea BoS the KC used to exist for that exact reason and they usually had a specialised group. An archery group doesn't need to operate like a melee group does. Totally different styles, movements etc. The general would pass the orders through for whatever kind of action we should be performing as a whole and the specialised groups react accordingly. I used to be the KC of the BlackKnights and we were spec'ed for speed and the charge.

Great example:
Melee is in bashing the enemy up, the archers / mages are looking in over the battle and casting magic on strays, and enemy reinforcements. The order to pull back to the perimeter comes in from the general, so the melee group starts backing out while the archers and mages provide cover. Or even better when the call for a pull out occurs a small group mounted rush the enemy to distract them and break them up while the melee group retreats and when the mounted are out of the way the enemy is in clear view of the range group.

What makes a man turn neutral? Lust for gold? Power? Or were you just born with a heart full of neutrality?